This word is not acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

v. To expel air as a reflex induced by an irritation in the nose.

"Most of the bodily functions can be described by words suited to polite society or physiological terminology: for example, eructate, masticate, sternutate, micturate, defaecate"

sternutation   

sneeze